If you spot the Hitachi GST Touro Mobile Pro USB 3.0 external HDD for a reasonable price you really should consider picking it up.  Just looking at the speed charts on NikkTech shows you that this USB 3.0 drive can keep up with eSATA drives and other USB 3.0 drives.  At 80 x 126 x 15mm and weighing 155g it is extremely portable, though the cable only being 1' long is a pity.  If you are in the market for large portable storage that is quick enough your copying doesn't take all night this is worth checking out.

"Only 25 or so days before we go dark for our much anticipated Christmas vacations (which shouldn't last more than 10 days in total) and so we decided to mainly focus on reviews requested by some of you during the last 2 months. Needless to say we are already testing quite a few gaming peripherals for the past 2 weeks so there isn't really much time for anything else that requires time and effort to test, however since the primary concern of most of you have been 2.5" portable hard disk drives (much easier/faster to test) we gathered quite a few of the latest USB 3.0 models here to see which delivers the most bang for your buck. The first of those portable USB 3.0 HDDs is no other than the latest Touro Mobile Pro 500GB by HGST."

Here are some more Storage reviews from around the web:

Storage